L, PPAmP, Benjamin Franklin Papers, vol. 10, fol. 101. Docketed: “Peirce Powers/Brest/July 7th/1778—.” The addressee is not given; the editors have surmised that it was Niles because, as seen in the letter from Lt. Thomas Simpson to Niles, 4 July, above, he was leaving Brest on or about 7 July in order to visit the American Commissioners at Passy.